html,
body {
  scroll-behavior: smooth;
}
.banner{
    width: 1200px;
    margin: 0 auto;
}
.project{
    width: 1200px;
    margin: 0 auto;
}
.mr1{
    margin-right: -25px;
}
.mr2{
    margin-bottom: 180px;
}
.project .box-hd{
    width: 1200px;
    height: 20px;
}
.project .box-hd {
    overflow: hidden;
    padding: 49px 0 65px;
}
.project .box-hd .title {
    float: left;
    font-size: 14px;
    line-height: 14px;
}
.project .pro-nav{
    float: right;
    width: fit-content;
    overflow: hidden;
}
.project .pro-nav .pro-nav-item{
    float: left;
    width: 98px;
    line-height: 14px;
    font-size: 14px;
    text-align: center;
}
.project .pro-nav .nav-line{
    width: 1px;
    height: 8px;
    float: left;
    background-color: #b5b5b5;
    margin-top: 3px;
}
.project .pro-nav-item .line{
    display: block;
    width: 12px;
    height: 1px;
    background-color: #688cac;
    margin: 3px auto 0;
    opacity: 0;
}
.project .pro-nav-item:hover a{
    font-size: 16px;
    color: #688cac;
}
.project .pro-nav-item:hover .line{
    opacity: 1;
}
.project .pro-nav-item.actyve a{
    font-size: 16px;
    color: #688cac;
}
.project .pro-nav-item.actyve .line{
    opacity: 1;
}



.project .pro-list{
    overflow: hidden;
}
.project .pro-item{
    position: relative;
    float: left;
    width: 360px;
    height: 270px;
    margin-right: 60px;
}
.pro-list .pro-item .bg{
     width: 360px;
     height: 180px;
}
.pro-list .pro-item .info{
    position: relative;
    width: 260px;
    height: 34px;
    margin: 28px 50px 0;
}
.pro-list .pro-item .info .city{
    height: 14px;
    line-height: 14px;
    font-size: 14px;
    margin-bottom: 7px;
}
.pro-list .pro-item .info .desc{
    height: 13px;
    line-height: 13px;
    font-size: 12px;
}
.pro-list .pro-item .info .icon{
    position: absolute;
    top: 2px;
    right: 0;
    width: 30px;
    height: 30px;
    background: url(../img/icon1.png)no-repeat center;
}
.project .pro-item .mask{
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    color: #fff;
    background-color: rgba(0, 0,0, 0.5);
    border-radius: 8px;
    opacity: 0;
}
.pro-item .mask .city{
    font-size: 14px;
    line-height: 15px;
    margin-top: 58px;
    margin-left: 50px;
}
.pro-item .mask .desc{
    font-size: 12px;
    line-height: 12px;
    margin-left: 50px;
    margin-top: 4px;
}
.pro-item .mask .writings{
    font-size: 12px;
    margin-left: 50px;
    margin-top: 19px;
}
.pro-item .mask .icon{
    position: absolute;
    bottom: 50px;
    right: 30px;
    width: 40px;
    height: 40px;
    background:url(../img/icon2.png) no-repeat center;
}
.project .pro-item:hover .info{
    display: none;
}
.project .pro-item:hover .bg img{
    display: none;
}
.project .pro-item:hover .mask{
    opacity: 1;
}
.project .pro-item:hover .bg{
    height: 270px;
    background: url(../img/project.jpg)no-repeat center;
}